0.0.11 has history now, good!
Although all my contacts are local numbers without country code, at least I can ask the friends to send me a whatsapp message so that I can keep a log for "opening" chat to them later on. :-)
By the way, before having contact synchronization, could you add the country code to phone numbers NOT having country code in addressbook for a quick workaround? Something like:

for each numbers {
if not ( number in intl format ) {
number = cc + number (cc already in yappari config file right?)
}
}